A8300 and A8300-1: Single LNB Supply and Control Voltage Regulators

Intended for analog and digital satellite receivers, these single low noise block converter regulators (LNBR) consist of a monolithic boost converter followed by a low-drop linear regulator. They are specifically designed to provide the power and the interface signals to an LNB down converter via coaxial cable in satellite TV receiver systems.

The A8300 and A8300-1 require few external components, with the boost switch and compensation circuitry integrated inside of the devices. The 563 kHz switching frequency is chosen to minimize the size of the passive filtering components.

For DiSEqC™ communication the ICs provide an internal 22-kHz tone that is gated with a control pin, or can accept an external 22-kHz through this same pin. In addition, these devices have integrated tone detection capability for full twoway DiSEqC™ communications, as well as an integrated gate drive for the filter bypass FET.

The I2C™-compatible interface provides control capabilities for complex system requirements, as well as diagnostic capabilities for system fault reporting. A sleep pin is also available to maximize power savings and to quickly shut down the device if needed, without using I2C™ control.

The devices also offer an Early Power Failure (EPF) function, which helps to verify the status of the 12 V rail as well as initiate shutdown routines.

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.